A coupled-inductor-based lcc resonant converter with the primary-parallel-secondary-series configuration to achieve output-voltage sharing for HV generator applications

Saijun Mao*, Yu Chen, Chengmin Li, Wuhua Li, Jelena Popovic, Jan Abraham Ferreira

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

In this paper, a coupled-inductor-based LCC resonant converter with the primary-parallel-secondary-series (PPSS) configuration is proposed to achieve output-voltage sharing ability for HV generator applications. The PPSS configuration of the LCC resonant converter with the voltage multipliers is introduced to achieve high output-voltage and increase the output-power level. However, the variations of the magnetizing inductance, leakage inductance, and winding capacitance of the HV transformer and voltage multiplier impact on the output-voltage sharing performance. Subsequently, the resonant inductors in the primary side of the conventional LCC resonant converters with the PPSS configuration are coupled to achieve the output-voltage sharing without any additional circuits and control efforts. Furthermore, an analytical equivalent circuit model considering the magnetizing inductor of the HV transformer is derived to analyze the output-voltage sharing ability. Moreover, the design method for the coupled inductors considering the output-voltage sharing performance affected by the leakage inductance of the coupled inductors is presented. Finally, the output-voltage sharing performance of the proposed coupled-inductor-based LCC resonant converter with the PPSS configuration is validated by the experimental results of a 50-V input, 5-kV output 100-W prototype. The prototype experimental results show that the unbalance voltage degree decreases from 67.7% to 8.5% with the utilization of the coupled inductor.

Original languageEnglish
Article number8477184
Pages (from-to)6108-6122
Number of pages15
JournalIEEE Transactions on Power Electronics
Volume34
Issue number7
DOIs
Publication statusPublished - 2019

Keywords

  • Coupled inductors
  • equivalent circuit modeling
  • HV generator
  • LCC resonant converter
  • output-voltage sharing
  • primary-parallel-secondary-series

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